National Semiconductor LM5066 and LM5064 hot swap controllers

National Semiconductor Corp. introduced two new high-voltage system power management and protection integrated circuits (ICs) with on-chip power management bus (PMBus) support.

The 48V input voltage LM5066 and -48V input voltage LM5064 integrate high-performance system protection and management blocks that precisely measure, control and manage the electrical operating conditions in systems such as routers, switches and base stations. The LM5066 and LM5064 enable comprehensive system power management for improving system reliability and reducing power consumption in wired and wireless telecom infrastructure systems that operate from high-voltage system backplanes.

The LM5066 features a voltage input range of 10V to 80V and the LM5064 operates over a range of -9V to -80V. Both ICs have selectable 25 mV/50 mV current limit thresholds for addressing a wide range of intermediate bus voltages and load currents. A measurement block measures both current and voltage at 1,000 times per second with 4.5 percent accuracy over the full temperature range. Simultaneous sampling of current and voltage provides true power measurement of the system’s power consumption. The measurement block also captures the peak current and peak power and computes the average of subsystem operating parameters (Vin, Iin, Pin and Vout) over a user-programmable time frame, offloading the processing burden from an external microcontroller.

A temperature monitoring block interfaces with a low-cost external diode to measure temperature of the external MOSFET or other critical temperature source. The LM5066 and LM5064 report the status of all system parameters and fault conditions through the SMBus interface and offer individually programmable warning thresholds for all faults. This feature provides design flexibility and dynamic system protection.

Pricing: $4.95 each in quantities of 1,000.

Availability: The LM5066 is available now and production quantities of the LM5064 will be available in August.